Using Timer to Buy and different indicator to Sell Strategy Help

[Liz]

Hi, I'm new to backtrader so thank you in advance for answering a probably obvious question.

My example strategy is to execute a buy on a given day (weekday 4), and sell according to an indicator (when RSI >70) .

I am having trouble getting these 2 actions to tie together correctly. I can run the code successfully, but it seems as though it isn't taking into account the buy day.

Any help / further guidance is appreciated.

import backtrader as bt
import datetime
matplotlib.use('QT5Agg')

class firstStrategy(bt.Strategy):

    def __init__(self):
        self.rsi = bt.indicators.RSI_SMA(self.data.close, period=21)
        self.add_timer(
        when=bt.timer.SESSION_END,
        weekday=[4],
        weekcarry=True,
        timername='buytimer', # in case the day is a non-trading day the timer should kick in on the next trading day
        )
    def notify_timer(self, timer, when, *args, **kwargs):
        if not self.position:
                self.buy(size=1)
    
    def next(self):
#        if not self.position:
#            self.notify_timer(timer,when)
#
#        else:
        if self.rsi > 70:
                self.sell(size=1)


#Variable for our starting cash
startcash = 100000

#Create an instance of cerebro
cerebro = bt.Cerebro()

#Add our strategy
cerebro.addstrategy(firstStrategy)

data = bt.feeds.YahooFinanceCSVData(
    dataname='BTC-USD.csv',
    fromdate=datetime.datetime(2019, 5, 1),   #2014, 9, 21
    todate=datetime.datetime(2020, 7, 8)
    )

#Add the data to Cerebro
cerebro.adddata(data)

# Set our desired cash start
cerebro.broker.setcash(startcash)

# Run over everything
cerebro.run()

#Get final portfolio Value
portvalue = cerebro.broker.getvalue()
pnl = portvalue - startcash

#Print out the final result
print('Final Portfolio Value: ${}'.format(portvalue))
print('P/L: ${}'.format(pnl))

#Finally plot the end results
cerebro.plot(style='candlestick',iplot=False)

[run-out]

Just a few things to tidy up your code.

@Liz said in Using Timer to Buy and different indicator to Sell Strategy Help:

weekday=[4],

Weekdays is plural.

Check if there's an open order in:

 def notify_timer(self, timer, when, *args, **kwargs):
        if not self.position or not self.order:
            self.buy(size=1)

Use close instead of sell in next:

 if self.position and self.rsi > 70:
     self.close()